Pentel Eraser Refills for Mechanical Pencils Pack of 15 (PDE1BP3-K6)Pentel Eraser Refills for Mechanical Pencils Pack of 15 (PDE1BP3-K6) - Pentel is also the inventor of non-permanent marker technology. Refill eraser for al, ax and pd series pencils 5 pcs/tube, 3-pk pentel co. Is a privately held japanese company which produces stationery products. The name is a combination of the english words pen and tell. , Ltd.